Unique Duplex / Triplex Question

[Hillary Buckingham]

There's a duplex on the market I'm interested in purchasing as owner-occupied with the opportunity to convert the basement into a third unit. The current units are a 1-bedroom and 2-bedroom unit and the basement could be converted into another 2-bedroom unit over the next year of me living there.

When I move out in a year, is it possible to continue classifying the property as a duplex if I chose to utilize the 1-bedroom unit as a personal office space and only rent out the existing and new 2-bedroom units?